Process of producing metal pipe.



G. D. DRSEY.

PROCESS 0F PRODUGING METAL PIPE.

APPLVIGATION FILED MAR. za, 190s.

909,376. Patented Jan. 12, 1909.

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GRAFTON D. DORSEY, OF NEW YORK, N. Y.

PROCESS OF PRODUCING- IWETAL PIPE.

Specification of Letters Patent.

Patented Jan. 12, 1909.

Application filed March 28, 1908. Serial No. l1123,810.

o all whom it lmay concer/n.'

Be it known that I, GRAFTON D. DoRsnY, a citizen of the United States, and resident of New York city, in the county of New York and State of New York, have invented a new and useful Improvement in Processes of Froducing Metal Pipe, of which the following is a specification.

My invention relates to a process of pr0.

ducing metal pipe, particularly soft metal pipe such as antimonial lead pipe which is provided at frequent intervals with an identifying mark such as a trademark, size mark or any distinguishing character formed in the metal of the pipe itself.

Lead pipe has heretofore been hand marked after completion. The costof hand marking is such that the marks are usually only stamped once on a length'of pipe.-

Moreover, when pipe is coiled as it comes f from' the press, it is impracticable to thereafter apply the mark -or marks at frequent intervals throughout its length.

Myinvention, therefore, consists in a v method of applying the desired marks to the pipe frequent intervals throughout its length 1n the process of manufacture.

rlhe accompanying. drawing illustrates?A mechanism which maybe employed in carrying put my process.

Figure 1 1s an elevation of so much of a' press with my invention applied to it as is' necessary to clearly understand the same.

Fig. 2 is a side4 elevation of Fig. 1. Fig. 3 is a/detail edge view of a marking pulley or Fig. 4 is. a length of completed pipe showing the identifying mark thereon. Fig. 5 is a view similar' to Fig. 1, of a modified form of apparatus' for carrying out the invention.

Reference numeral 1 designates the head.

of any suitable press for forming pipe such as lead pipe or antimonial leadI pipe by` extru- Molten metal is supplied to the press The pipev 2 is sion. 1n any approved manner.

l'shown issuing from the press warm and not fully hardened. The pipe, which in the present instanpe is, to be coiled, passes over the marking pulley 3. The pulley is provided at one or. more points on its face engaging the pipe with the desired identifying marks. 4, arranged reversely, as for printing. The pulley 3 may be mounted on la shaft' 4 and the tween them serv shaft may be impelled by drive pulleys 5 at In the coiled or wound on a spool for the market. I

Fig. 4 shows a completed length of pipe bearing the identifying mark 4fL at frequent intervals throughout its length.

In' Fig. 5 is shown a press similar to that of employed two markin rolls 3, v3a. Either one or both of these ro ls may carry characters to be impressed upon the pipe'. The

rolls may originallybe set at a certain dis- Figs. 1 and 2, in connection with which are tance apart calculated for a particular size of mere passage of the pipe be- `es to impress the marks upon it. Other means for applying pressure to the pipe may be employed. An instance of such means is shown in Fig. 5 in which roll :3 is carried in movable blocks 6, and/ these pipe so that the blocks are urged toward the other roll by springs 7. It is to illustrated and described is only one representation of various means by which the invention may be carriedout.

Ther process constituting my invention, as willbe readily understood from the foregoing description of the apparatus by which it may be carried out, consists in heating metal of be understood that the apparatusthe character described, lextrnding it from a press in tubular form and printing identifying marks upon the tube while it is warm and soft at intervals throughout its length. I claim:

The herein-described process of marking' soft metal pipe consistlng in .heating the metal,. extruding it from apress in tubular form and printing identifying marks upon the tube while it is still warm and soft at intervals throughout its length.

l GRAFTON D. DORSEY. Witnesses: l

HENRY G. GREEN,

. LEN'ARD W. ORSON.` 

